They are having a harder time making payments on their loans.
Therefore the burden should be shifted to those who are doing better.
Here's a thought: hard science and engineering programs attract the vast bulk of grant money.
Humanities professors get paid as much - and often more - than engineering professors, but they produce a tiny fraction of the grants.
Humanities are already being heavily subsidized - perhaps humanities students should be forced to shoulder the burden.
If there is no market for buggy whips, why do we keep producing them? Government.